[Hyperkinetic syndrome following premedication with Thalamonal].

A rare hyperkinetic syndrome in a child after premedication with Thalamonal has been known for some time. The triad: unconsciousness, opisthothonus and conjugate deviation should be considered by surgeon and anesthetist and it looks like the somnolent-ophthalmoplegic-hyperkinetic type of Economo's Encephalitis lethargica. The therapy is simple: 1 ml Biperiden i.v.